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The mutation rates of dnaQ49 strains compared to umuC::Tn5 derivatives in salt-free LB media: a at 32° C; b at 37° C. The recA alleles from left to right have increasing RecA* activity. For each recA allele the bars from left to right are the mutation rates of lexA3 [=lexA(Ind-)], lexA+, and lexA51 [lexA (Def)] derivatives
